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Clemizole hydrochloride (Synonyms: AL 20, Allercur)

Catalog No.GC17701

An antihistamine and TRPC5 channel blocker

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Clemizole hydrochloride Chemical Structure

Cas No.: 1163-36-6

Size Price Stock Qty
10mM (in 1mL DMSO)
$40.00
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5mg
$37.00
In stock
10mg
$62.00
In stock
50mg
$220.00
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100mg
$329.00
In stock

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Sample solution is provided at 25 µL, 10mM.

Product Documents

Quality Control & SDS

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Protocol

Cell experiment:

Huh7.5 cells are maintained in DMEM supplemented with 1% L-Glutamine, 1% Penicillin, 1% Streptomycin, 1× nonessential amino acids and 10% FBS. Cell lines are passaged twice weekly after treatment with 0.05% trypsin-0.02% EDTA and seeding at a dilution of 1:5. Subconfluent Huh7.5 cells are trypsinized and collected by centrifugation at 700g for 5 min. The cells are then washed three times in ice-cold RNase-free PBS and resuspended at 1.5×107 cells/mL in PBS. Wild-type or mutant FL-J6/JFH-5′C19Rluc2AUbi RNA for electroporation is generated by transcription of XbaI linearized DNA templates using the T7 MEGAscript kit, followed by purification (RNA transcription and fluorescent labeling). We mixed 5 µg of RNA with 400 µL of washed Huh7.5 cells in a 2-mm-gap cuvette (BTX) and immediately pulsed (0.82 kV, five 99 µs pulses) with a BTX-830 electroporator. After a 10 min recovery at 25°C, pulsed cells are diluted into 10 mL of prewarmed growth medium. Cells from several electroporations are pooled to a common stock and seeded in 6-well plates (5×105 cells per well). After 24 h, medium is replaced and cells are grown in the presence of serial dilutions of the various inhibitory compounds (e.g., Clemizole hydrochloride) identified in the screen. Seventeen commercially available compounds, out of the 18 identified, are analyzed. Untreated cells are used as a negative control for water-soluble compounds. For compounds (e.g., Clemizole hydrochloride) solubilized in DMSO, untreated cells are grown in the presence of corresponding concentrations of the solvent as a negative control. Medium is changed daily. After 72 h of treatment cells are subjected to an Alamar Blue-based viability assay and luciferase assay. After 72 h of treatment cells are incubated for 3 h at 37°C in the presence of 10% Alamar Blue reagent. Plates are then scanned and fluorescence is detected by using FLEXstation II 384. Depending on the inhibitory compound’s solvent (e.g., Clemizole hydrochloride), water or DMSO, signal is normalized relatively to untreated samples or samples grown in the presence of DMSO, respectively[1].

Animal experiment:

Mice[3]Eight control NOG mice and eight humanized TK-NOG mice are administered 25 mg/kg by mouth Clemizole, and blood samples are collected 30 minutes after administration. The C57BL/6J mice (3 per time point) are given 25 mg/kg by mouth clemizole, and blood samples are collected for analysis at 15 and 30 minutes and 1, 2, 4, and 6 hours after administration. For the DDI studies, eight humanized TK-NOG mice are given Clemizole (25 mg/kg by mouth) with or without Ritonavir (20 mg/kg by mouth), and blood samples are collected 30 minutes after administration. Six of these mice are also treated with Debrisoquine (10 mg/kg by mouth) in the presence or absence of Ritonavir (20 mg/kg by mouth), and plasma samples are obtained 2 hours later for analysis.

References:

[1]. Einav S, et al. Discovery of a hepatitis C target and its pharmacological inhibitors by microfluidic affinity analysis. Nat Biotechnol. 2008 Sep;26(9):1019-27
[2]. Richter JM, et al. Clemizole hydrochloride is a novel and potent inhibitor of transient receptor potential channel TRPC5. Mol Pharmacol. 2014 Nov;86(5):514-21
[3]. Nishimura T, et al. Using chimeric mice with humanized livers to predict human drug metabolism and a drug-drug interaction. J Pharmacol Exp Ther. 2013 Feb;344(2):388-96.

Background

IC50: 8 mM (NS4B)

The NS4B protein is a key player in HCV replication. Disrupting NS4B function thus represents an attractive new anti-HCV strategy. Combining clemizole with other anti-HCV agents could increase the antiviral effect achieved with 1 active drug alone and decrease emergence of viral resistance.

In vitro: Although significant, clemizole’s antiviral effect was moderate (50% effective concentration of 8 mM against a HCV genotype 2a clone). Clemizole’s antiviral effect was highly synergistic with the HCV protease inhibitors VX950 and SCH503034, without toxicity. In contrast, clemizole combinations with either interferon, ribavirin, or the nucleoside (NM283) and nonnucleoside (HCV796) HCV polymerase inhibitors were additive [1].

In vivo: Clemizole had an unexpectedly short plasma half-life; it was very rapidly bio-transformed into a glucuronide (M14) and a dealkylated metabolite (M12) and into a variety of lesser metabolites in C57BL/6J mice [2].

Clinical trial: The purpose of a study was to test the hypothesis that clemizole hydrochloride was safe and well tolerated when administered to subjects who were infected with hepatitis C virus and had not yet received treatment. This clinical study would also examine how the virus and body respond to clemizole hydrochloride (https://clinicaltrials.gov/ct2/show/NCT00945880?term=Clemizole&rank=1).

References:
[1] Einav S, Sobol HD, Gehrig E, Glenn JS.  The hepatitis C virus (HCV) NS4B RNA binding inhibitor clemizole is highly synergistic with HCV protease inhibitors. J Infect Dis. 2010;202(1):65-74.
[2] Nishimura T, Hu Y, Wu M, Pham E, Suemizu H, Elazar M, Liu M, Idilman R, Yurdaydin C, Angus P, Stedman C, Murphy B, Glenn J, Nakamura M, Nomura T, Chen Y, Zheng M, Fitch WL, Peltz G.  Using chimeric mice with humanized livers to predict human drug metabolism and a drug-drug interaction. J Pharmacol Exp Ther. 2013;344(2):388-96. doi: 10.1124/jpet.112.198697. Epub 2012 Nov 8.

Chemical Properties

Cas No. 1163-36-6 SDF
Synonyms AL 20, Allercur
Chemical Name 1-[(4-chlorophenyl)methyl]-2-(pyrrolidin-1-ylmethyl)benzimidazole;hydrochloride
Canonical SMILES C1CCN(C1)CC2=NC3=CC=CC=C3N2CC4=CC=C(C=C4)Cl.Cl
Formula C19H21Cl2N3 M.Wt 362.3
Solubility ≥ 18.115 mg/mL in DMSO, ≥ 15.13 mg/mL in EtOH with ultrasonic and warming, ≥ 5.12 mg/mL in Water with ultrasonic and warming Storage Store at -20°C
General tips Please select the appropriate solvent to prepare the stock solution according to the solubility of the product in different solvents; once the solution is prepared, please store it in separate packages to avoid product failure caused by repeated freezing and thawing.Storage method and period of the stock solution: When stored at -80°C, please use it within 6 months; when stored at -20°C, please use it within 1 month.
To increase solubility, heat the tube to 37°C and then oscillate in an ultrasonic bath for some time.
Shipping Condition Evaluation sample solution: shipped with blue ice. All other sizes available: with RT, or with Blue Ice upon request.

Complete Stock Solution Preparation Table

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1 mg 5 mg 10 mg
1 mM 2.7601 mL 13.8007 mL 27.6014 mL
5 mM 0.552 mL 2.7601 mL 5.5203 mL
10 mM 0.276 mL 1.3801 mL 2.7601 mL
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